Influence of bubble approach velocity on coalescence in α-terpineol and n-octanol solutions
 
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Department of Multiphase Reactors, Institute of Chemical Process Fundamentals of the CAS, v. v. i.
2
Institute of Chemical Process Fundamentals of the CAS, v. v. i.
CORRESPONDING AUTHOR
Sandra Kordac Orvalho   

Department of Multiphase Reactors, Institute of Chemical Process Fundamentals of the CAS, v. v. i., Institute of Chemical Process Fundamentals of the CAS, v. v. i., Rozvojova 2/135, 16502 Prague 6 - Suchdol, Czech Republic
 
Physicochem. Probl. Miner. Process. 2018;54(1):73–80
 
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ABSTRACT
This work presents results of an experimental study of the influence of the approach velocity on the coalescence of bubbles in aqueous solutions of n-octanol and α-terpineol. Experiments were performed in a coalescence cell allowing synchronized growth of a pair of bubbles in a liquid. High speed camera imaging was used to characterized the growth of the bubbles and their interaction in aqueous solution of different concentrations of surfactants. Coalescence efficiency and contact time till coalescence were determined as function of the approach velocity between bubbles and the concentration of surfactant. It was found that, for both surfactants, when the approach velocity between bubbles is higher than ~1 mm/s, the coalescence efficiency is independent of approach velocity and that the contact time is independent of the concentration of surfactant. Below ~1 mm/s, both the coalescence efficiency and the contact time are function of the surfactant concentration. For the higher velocities, the suppression of coalescence occurs at concentrations similar to the concentration of immobilization of the surface of free rising bubbles.
eISSN:2084-4735
ISSN:1643-1049